Telephone-transmitter mouthpiece.



M. M. Woon. TELEPHONE TRANSMITTER MOUTHPIEGE. APPLICATION FILED DEC. 3,1908.

952,164, Patented Mar. 15, 1910.`

Y ANunEw B. unAMAM e0N PHOYLIYMOGRAPMHIs WASHINGTON, u. C.

UNITED STATES PTENT sIf MONTRAVILLE M. WOOD, OF BERWYN, ILLINOIS,ASSIGNOR, BY MESNE ASSIGNMENTS, TO W. H. FULL, OF FREEPORT, ILLINOIS.

TELEPHONE-TRANSMITTER IVIOUTHPIECE.

To all whom it may concern:

Be it known that I, MoNTRAviLLE M. IooD, a citizen of the United States,residing at Berwyn, in the county of Cook and State of Illinois, haveinvented a cert-ain new and useful Improvement in Telephone- TransmitterMouthpieces, of which the following is a specification.

This invention relates to mouth-pieces for telephone transmitters andits object is to provide such a device which can be easily assembled foruse and taken apart for cleaning, at the same time providing`satisfactory exits for air at the side of the mouth-piece so as to avoidpacking of the transmitter.

The invention consists in the use of a novel cushion device incombination with mechanism for attaching the transmitter cone inposition so that glass or other similar material which does not readilyyield to the use of either glue or screws or the like may be used andreadily attached and detached for cleaning without there being anyrattle effect to mar the efficiency of the instrument.

`It also consists in t-he novel means for providing ventilation of thetransmitter so as to prevent packino` of the transmitter, and in otherdetails of construction which will be hereinafter more fully describedand claimed.

Referring to the drawings, Figure 1 is a central sectional side view ofmechanism illustrating the preferred form of this invention. Fig. 2 is afront sectional view on the line 2 2 of Fig. 1. Fig. 3 is a detail viewof the corrugated disk by means of which ventilation of the transmitteris obtained. Fig. a is a side view of the thimble upon which thetransmitter cone is supported.

Some specific embodiment of the invention must be illustrated and one ofthe preferred forms is here shown, though manifestly many variations maybe made without departing from the broad spirit of this invention.Referring to such preferred form illustrated in the drawings, the deviceis shown attached to the front part or plate 10 of an ordinaryItransmitter casing or box. In this plate 10 is formed the usual circularopening inclosed by the flange 11, screw threaded at its interior in thescrew threads 12, as shown. Screw threaded into the threads 12 is ametallic cap or thimble 15 Specification of Letters Patent.

Application 1ed December 3, 1908.

Serial No. 465,800.

having screw threads 14 adapted to engage the threads 12 heretoforedescribed; a contracted portion 16 in front of the screw threadedportion, and an enlarged head or flange 17 connecting said contractedportion 16 and with the front face 18 having the perforations 19 asshown. The contracted portion 16 of this thimble is, as shown, in theform of an annular recess in which an interior annular flange 2O of thetelephone transmitter cone 21 is adapted to fit, as shown. In at leastthree equidistant points about the circumference of the front of thethimble 15 (in the particular case here shown at four such points) arecut spring members 22 which detachably engage the flange 2O of thetransmitter cone 21 and thus hold it in place adjacent to thetransmitter box wall 10. It hardly need be stated that the thimble ismade of material having suicient spring action so that these members 22act as stated and allow the flange 2O of the transmitter cone to passover them when the cone is inserted in place, and then spring back tothe positions of Fig. 1, thereby holding the transmitter cone 21 inplace. By the use of this construction, it is possible to use a glass orother fragile form of transmitter cone and detachably secure it in placeupon the thimble without the aid of cement, glue or screws or anythingof that sort. In fact, without anyl surface mutilation of the materialof the cone.

Attention is called to the fact by the use of the thimble with theperforated front face 1S the transmitter of the telephone not here shownbut always located inside the transmitter box or case, is protected fromaccidental injury by instruments inserted in the cone 21 or by theircoming in contact with it when the cone is removed for cleaning orsterilization.

It has been found in previous practice that a telephone transmitter conerequires ventilation at its base in order to prevent the packing of thecarbon dust ordinarily usedin the transmitter. In the preferred form ofthe invention here illustrated, the result is obtained by placing in therear portion of the contracted member 16, adjacent to the screw threadedmember of the thimble l5, a plurality of openings 24 which providepassageways from the interior of the sound passageway of the device tothe outside air. Over these openings 24 and be- Patented Mar. 15, 1910.

tween the wall l0 of the box and inner or t bottom rim of the cone 21 isplaced a circular' cushion disk 27. This disk is stamped or hasotherwise formed in it a plurality ot corrugations 29 extending aroundthe central opening 28. They are so shaped that they both act as semispring cushions tor the transmitter cone and form a plurality ofpassageways from the openings 24C heretot'ore described to the open air.These corrugations Q9 are of sutiicient number and depth so that nomatter what position the disk 2T may assume when the parts are in iinaladjusted position there will always be plenty of passageways leadingoutwardly from the openings 2l.

ln the operation of the device, the parts are assembled in the positionsshown in Fie. l. in which position, as stated, there are plenty otpassageways leading trom the interior ot the device through the openings2i and the spaces between the corrugations Qi), the walls of saidcorrugations act-ing at the same time as a cushion which keeps the conein noiseless or non rattling` grasp ot the springs 22.

that I claim as new, and desire to secure b v Letters Patent, is:

l. In a device ot' the class described the combination of a telephonetransmitter case or box, a transmitter cone therefor, a Vflange upon theinterior of the cone and spring mechanism carried by the box detachablyengaging said liange.

2. In a device of the class described in combination with the wall of atransmitter box or case, a thimble detachably secured thereto, springcatches on the front ot the thimble and a transmitter cone detachablysecured to said spring catches.

3. In a device of the class described in combination with the wall of atransmitter box or case, a thimble detachably secured thereto` springcatches on the front of the thimble, a` transmitter cone detachablysecured to said spring catches and a disk interposed between the coneand the transmitter box there being openings in the side Vall of thethimble and along` the plane oit said disk for the passage ot air asdescribed. et. lira device of the class described in combination withthe wall ot a transmitter box or case, a transmitter cone, means 'torsecuring the cone to the box and a disk between the cone and box, therebeing openings substantially in the plane ot the disk through which airmay pass described.

ln a device olf the class described in combination with the wall of atransmitter bex or case, a transmitter cone, means for securing the coneto the box and a disk be tween the cone and box having corrugationsformed in its :tace providing air passageways for the escape ot air asdescribed.

(j. A thimble for use in mechanism oit' the class described, means forattaching it to a transmitter box, and means 'tor securing a transmittercone to it, there being air pas* sz geways through the sides ot thethimble as and for the purposes set forth.

T. ln mechanism ot the class described, a transmitter box or case, amouthpiece or cone, cushion means between the two and. means forsecuring all together, there being` openings through the cushion meansthroi'lgh which sound waves may escape :tor the purposes forth.

ln witness whereof, l have hereunto subscribed my name in the presenceot two witnesses.

BINTRAVLLE M. VOOD.

Vitnesses Dwiorrr B. Ciinnvnn, C. J. CHmsTorrnL.

